Wide-temperature-range, high-load, fuel-resistant and high-speed rotating combined seal

Abstract

The utility model provides a wide-temperature-range high-load fuel-resistant high-speed rotating combined seal which comprises a base body, a reinforcing shell, an outer sealing ring and an inner spring. The base body is of an annular structure, a sealing face is formed in an inner hole of the base body and comprises a main sealing lip on the upper portion and an auxiliary sealing lip on the lower portion, and a lip opening spring groove is formed in the inner side of the main sealing lip and located in the middle upper position of the inner wall of the base body. An outer sealing groove is formed in the outer side of the base body and located in the lower middle position of the outer wall of the base body. The reinforcing shell is of a sleeve-shaped structure, a through hole corresponding to the inner hole of the base body is formed in the center of the reinforcing shell, and the reinforcing shell is connected with the periphery of the upper end of the base body in an interference fit mode. The outer sealing ring is of an annular structure and is embedded into the outer sealing groove of the base body. The inner spring is of an annular structure and is embedded into the lip spring groove. According to the combined sealing structure, through the double-lip design and the spring configuration, stable and reliable sealing performance can be provided under the severe working conditions of high rotating speed, high load, wide temperature range and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of rotary seal, specifically relates to a wide temperature range high load fuel oil resistant high speed rotary combination seal. BACKGROUND

[0002] In the aerospace engine fuel pump system, the sealing element is an important component to ensure the efficient operation of the system. The fuel pump delivers liquid fuel from the fuel tank to the combustion chamber and pressurizes and delivers the fuel at high speed during this process. The sealing element of the fuel pump needs to work stably for a long time under high speed, high pressure and complex chemical environment, and its performance directly affects the operation reliability of the whole system. However, the current rotary sealing technology still has obvious shortcomings in dealing with these harsh working conditions.

[0003] The existing sealing element widely uses rubber material as the main body, but the rubber material is easy to cause local carbonization due to friction heat under high speed rotation, which further causes sealing failure. At the same time, under the environment of soaking in aviation fuel for a long time, the rubber material often has problems such as swelling, deformation and even dissolution, which significantly reduces the sealing performance. In addition, the working temperature range of the existing sealing element is usually narrow, which is difficult to meet the use demand of-55℃ to 300℃ wide temperature range. Under low temperature conditions, the traditional rubber sealing element will cause leakage or structural damage due to material embrittlement; under high temperature conditions, it is easy to have problems such as heat resistance decline and material decomposition.

[0004] From the perspective of structural design, the existing rotary seal is mostly single-lip design, and the sealing performance is single, which is difficult to simultaneously meet the dual requirements of low friction and high load. When the pump shaft rotates at high speed, the single-lip structure is easy to leak due to uneven pressure on the sealing lip. In addition, under the condition of high speed rotation, the contact area between the sealing lip and the bearing is large, and the friction resistance is high, which causes severe wear and further shortens the service life of the sealing element.

[0005] For the working environment of the fuel pump, the sealing element also needs to withstand the impact of fluid turbulence and instantaneous pulse pressure, and the structural strength of the existing sealing element is often insufficient, which is easy to cause sealing failure due to local pressure fluctuation. At the same time, since the concentricity requirement of the sealing element and the pump shaft is high, the sealing element used in the existing technology is difficult to ensure complete coaxial during installation, which further affects the sealing effect.

[0006] In summary, the existing rotary sealing technology has obvious defects in high and low temperature resistance, fuel oil resistance, high speed rotation and high load working conditions, and it is difficult to meet the needs of high-precision fields such as aerospace engine fuel pumps. These technical defects limit the performance and application range of the sealing element, so it is an urgent need to develop a rotary sealing element with higher durability, wider temperature adaptability and stronger sealing performance. SUMMARY

[0007] The utility model provides a kind of wide temperature range high load fuel-resistant high-speed rotating combined seal, solve the problem that existing rotating sealing element is easy to fail under high load, high speed, wide temperature range and fuel-resistant working condition.

[0008] In order to achieve the above purpose, the technical scheme of the utility model is as follows:

[0009] A kind of wide temperature range high load fuel-resistant high-speed rotating combined seal, including matrix, reinforcing shell, outer sealing ring and inner spring;

[0010] The matrix is annular structure, and a sealing surface is formed in the inner hole of the matrix, the sealing surface includes a main sealing lip in the upper part and a secondary sealing lip in the lower part, a lip spring groove is provided on the inner side of the main sealing lip, and the lip spring groove is located at the upper part of the middle of the inner wall of the matrix;An outer sealing groove is provided on the outer side of the matrix, and the outer sealing groove is located at the lower part of the middle of the outer wall of the matrix;

[0011] The reinforcing shell is sleeve structure, and a through hole corresponding to the inner hole of the matrix is formed in the center of the reinforcing shell, and the upper end of the reinforcing shell and the matrix is connected by interference fit;

[0012] The outer sealing ring is annular structure, and is embedded in the outer sealing groove of the matrix;

[0013] The inner spring is annular structure, and is embedded in the lip spring groove.

[0014] Further, the main sealing lip and the secondary sealing lip are coaxially arranged along the center line of the inner hole of the matrix, the cross section of the main sealing lip is V-shaped structure inclined to the center line of the inner hole, and the concave part of the V-shaped structure constitutes the lip spring groove.

[0015] Further, the inner spring is V-shaped spring or U-shaped spring made of stainless steel.

[0016] Further, the sealing contact point of the main sealing lip is the inner side sharp point structure, and the sealing contact point is circular arc cross section, and forms linear contact with the surface of the sealed member.

[0017] Further, the sealing contact point of the secondary sealing lip is the inner side edge structure of the secondary sealing lip, and the sealing contact point forms linear contact with the surface of the sealed member.

[0018] Further, the distance of the sealing contact point of the secondary sealing lip relative to the center line of the inner hole of the matrix is less than the distance of the sealing contact point of the main sealing lip relative to the center line of the inner hole of the matrix.

[0019] Further, the outer sealing ring is fluorine ether rubber outer sealing ring, fluorine rubber outer sealing ring or fluorine silicon rubber outer sealing ring, and the cross section of the outer sealing ring is circular.

[0020] Further, the base body lower end extends out a ring-shaped boss, and an outer sealing groove is formed between the lower end of the reinforcing shell and the ring-shaped boss.

[0021] Further, the base body is a polytetrafluoroethylene base body or a modified polytetrafluoroethylene base body.

[0022] Further, the reinforcing shell is a stainless steel reinforcing shell or an aluminum alloy reinforcing shell.

[0023] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0024] The utility model discloses a sealing element structure design is optimized, effectively improved its in wide temperature range, high load and the adaptability and reliability of fuel oil working condition, the sealing surface formed by the base body inner hole is formed by main sealing lip and vice sealing lip, and the coaxial arrangement of both along the inner hole center line, the V-shaped section structure of main sealing lip is combined with the lip spring groove, and main sealing lip has stable axial force, and its arc convex sealing contact point forms line contact with the sealed element, thereby enhanced sealing effect, the arc edge of vice sealing lip is as sealing contact point, and main sealing lip maintains reasonable spacing in radial and axial direction, forms multiple seals, and further improves the reliability of sealing.

[0025] The utility model discloses a sealing element structure design is optimized, effectively improved its in wide temperature range, high load and the adaptability and reliability of fuel oil working condition, the sealing surface formed by the base body inner hole is formed by main sealing lip and vice sealing lip, and the coaxial arrangement of both along the inner hole center line, the V-shaped section structure of main sealing lip is combined with the lip spring groove, and main sealing lip has stable axial force, and its arc convex sealing contact point forms line contact with the sealed element, thereby enhanced sealing effect, the arc edge of vice sealing lip is as sealing contact point, and main sealing lip maintains reasonable spacing in radial and axial direction, forms multiple seals, and further improves the reliability of sealing.

[0026] Of course, the various technical solutions of the utility model need not necessarily achieve all the advantages mentioned above at the same time. DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings of embodiments can also be obtained according to these drawings without creating labor.

[0028] Figure 1 It is the whole structure schematic diagram of the embodiment of the utility model;

[0029] In the drawing,

[0030] 1-base body, 2-reinforcing shell, 3-outer sealing ring, 4-inner spring, 5-main sealing lip, 6-vice sealing lip. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0032] In the description of the present patent, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present patent.

[0033] In the description of the present patent, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, set, or it can be detachably connected, set, or integrally connected, set. For those skilled in the art, the specific meaning of the above terms in the present patent can be understood according to the specific circumstances.

[0034] The present application will be described in detail below with reference to the specific embodiments of the drawings.

[0035] Example 1

[0036] Referring to Figure 1 , the present embodiment provides a wide temperature range high load fuel resistant high speed rotating combined seal, which comprises a base body 1, a reinforcing shell 2, an outer sealing ring 3, an inner spring 4, a main sealing lip 5 and a secondary sealing lip 6; the base body 1 is made of polytetrafluoroethylene (PTFE) material and has a ring structure; the inner hole surface of the base body 1 is machined to form the main sealing lip 5 and the secondary sealing lip 6 according to the position Figure 1 ; the cross section of the main sealing lip 5 is a V-shaped structure inclined to the inner hole center line, and the inner concave part forms a lip spring groove; the secondary sealing lip 6 is located below the main sealing lip 5 and is designed with a universal force, and its sealing contact point is located at the inner edge thereof.

[0037] The inner spring 4 is a V-shaped spring made of stainless steel, which is embedded in the lip spring groove on the inner side of the main sealing lip 5 of the base body 1, and provides stable shaft holding force to ensure the close contact between the main sealing lip 5 and the rotating shaft. The reinforcing shell 2 is made of stainless steel and has a sleeve structure with a through hole corresponding to the inner hole of the base body 1. The reinforcing shell 2 is installed on the outer periphery of the upper end of the base body 1 by interference fit, ensuring close combination of the two and enhancing the overall structural strength. The outer sealing ring 3 is made of fluoroether rubber material and has a circular cross section, which is embedded in the outer sealing groove on the outer side of the base body 1 to ensure its close fixation in the groove and provide reliable external sealing. It should be noted that in other embodiments, the outer sealing ring 3 can also be made of fluorine rubber, fluorosilicone rubber and other corrosion-resistant and high-temperature-resistant materials that meet the working conditions.

[0038] The main sealing lip 5 and the auxiliary sealing lip 6 are coaxially arranged along the center line of the inner hole of the base body 1. The main sealing lip 5 has a V-shaped structure in cross section to provide efficient sealing contact. The auxiliary sealing lip 6 is designed with a wide contact area to reduce the contact area with the bearing and reduce friction resistance. The double-lip structure design makes the main sealing lip 5 responsible for the main sealing function, which provides stable shaft holding force through the V-shaped cross section and the inner spring 4 to ensure close contact with the rotating shaft and prevent fuel leakage. The auxiliary sealing lip 6 is designed with a wide contact area to reduce the contact area with the bearing and reduce friction resistance, thereby prolonging the service life of the sealing element. At the same time, the presence of the auxiliary sealing lip 6 provides auxiliary sealing and enhances the overall sealing performance.

[0039] In terms of spring configuration, the V-shaped spring 4 is embedded in the lip spring groove to provide continuous elastic support, ensuring that the main sealing lip 5 maintains stable sealing contact under high load and high speed rotation conditions, preventing sealing failure due to frictional heat. The metal reinforcing shell 2 is connected by interference fit, which uniformly distributes the fuel pressure and prevents liquid pulse pressure from impacting the sealing lip, while improving the concentricity of the sealing element to ensure good sealing performance under high speed and high load. The outer sealing ring 3 made of fluoroether rubber material is suitable for a wide temperature range, providing reliable external sealing to prevent the influence of the external environment on the internal structure of the sealing element, ensuring stable operation in a temperature range of -55°C to 200°C.

[0040] Example 2:

[0041] To further enhance the adaptability and reliability of the seal, the inner spring 4 is replaced by a U-shaped spring; the U-shaped spring is also embedded in the lip spring groove on the inner side of the main sealing lip 5 of the base body 1, providing stable shaft holding force; compared with the V-shaped spring, the U-shaped spring provides more flexible elastic support in certain application scenarios (such as the need for more flexible adjustment of the axial force); the design of the U-shaped spring enables it to better adapt to changes under different load conditions, further enhancing the adaptability and reliability of the seal. Under the same working conditions, the rotary seal using the U-shaped spring exhibits sealing performance comparable to that of the V-shaped spring, while in the case of needing to adjust the axial force, it exhibits better adjustment capability, ensuring the close contact of the main sealing lip 5 with the rotating shaft.

[0042] It should be noted that the above-described embodiments and drawings are only specific application modes of the present application, and those skilled in the art can make various deformations or equivalent replacements to the shape, proportion and material without departing from the scope of the technical scheme of the present application, and these deformations and replacements also fall within the protection scope of the present application.

Claims

1. A wide temperature range, high load, fuel resistant, high speed rotary combination seal, characterized in that, The base, the reinforcing shell, the outer sealing ring and the inner spring are included. The base is a ring structure, a sealing surface is formed in the inner hole of the base, the sealing surface includes a main sealing lip in the upper part and a secondary sealing lip in the lower part, a lip spring groove is arranged on the inner side of the main sealing lip, and the lip spring groove is located at the upper middle part of the inner wall of the base; an outer sealing groove is arranged on the outer side of the base, and the outer sealing groove is located at the lower middle part of the outer wall of the base. The reinforcing shell is a sleeve structure, a through hole corresponding to the inner hole of the base is formed in the center of the reinforcing shell, and the reinforcing shell is connected with the outer periphery of the upper end of the base through interference fit. The outer sealing ring is a ring structure and is embedded in the outer sealing groove of the base. The inner spring is a ring structure and is embedded in the lip spring groove.

2. The wide temperature range high load fuel resistant high speed rotary combination seal of claim 1, wherein, The main sealing lip and the secondary sealing lip are coaxially arranged along the center line of the inner hole of the base, the cross section of the main sealing lip is in a V-shaped structure inclined to the center line of the inner hole, and the inner concave part of the V-shaped structure constitutes the lip spring groove.

3. The wide temperature range high load fuel resistant high speed rotary combination seal of claim 2, wherein, The inner spring is a V-shaped spring or a U-shaped spring made of stainless steel.

4. The wide temperature range, high load, fuel resistant, high speed rotary combination seal of claim 2, wherein, The sealing contact point of the main sealing lip is a sharp point structure on the inner side, the sealing contact point is in a circular arc cross section, and forms linear contact with the surface of the sealed member.

5. The wide temperature range, high load, fuel resistant, high speed rotary combination seal of claim 4, wherein, The sealing contact point of the secondary sealing lip is an edge structure on the inner side of the secondary sealing lip, and forms linear contact with the surface of the sealed member.

6. The wide temperature range, high load, fuel resistant, high speed rotary combination seal of claim 5, wherein, The distance of the sealing contact point of the secondary sealing lip from the center line of the inner hole of the base is less than the distance of the sealing contact point of the main sealing lip from the center line of the inner hole of the base.

7. The wide temperature range, high load, fuel resistant, high speed rotary combination seal of claim 1, wherein, The outer sealing ring is a fluoroether rubber outer sealing ring, a fluororubber outer sealing ring or a fluorosilicone rubber outer sealing ring, and the cross section of the outer sealing ring is circular.

8. The wide temperature range, high load, fuel resistant, high speed rotary combination seal of claim 1, wherein, The lower end of the base extends a ring-shaped boss, and the outer sealing groove is formed between the lower end of the reinforcing shell and the ring-shaped boss.

9. The wide temperature range, high load, fuel resistant, high speed rotary combination seal of claim 1, wherein, The base is a polytetrafluoroethylene base or a modified polytetrafluoroethylene base.

10. The wide temperature range, high load, fuel resistant, high speed rotary combination seal of claim 1 wherein, The reinforcing shell is a stainless steel reinforcing shell or an aluminum alloy reinforcing shell.

Images